Question

A coin placed 30.6 cm from the center of a rotating, horizontal
turntable slips when its speed is 49.3 cm/s.
(a) What force causes the centripetal acceleration when the coin is
stationary relative to the turntable?
a)static friction
b)inertia
c)kinetic friction
d)centrifugal force
.

(b) What is the coefficient of static friction between coin and
turntable?